Finding TDC for each cylinder?
08-09-2005, 03:27 PM
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Finding TDC for each cylinder?
I have heard several ways of finding TDC for each piston when doing a valve lash adjustment. Which is best? Should I rely on the camshaft sprocket marks? Should I watch the distributor to see what spark plug it points to? Or should I watch the lifters to see when the next one is about to fire?
08-09-2005, 03:49 PM
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Re: Finding TDC for each cylinder? (houstondigital)
You first start off with TDC for cylinder 1. So that means that the crank pulley marker should line up with the marker on the timming belt cover and the camshaft gear should line with the TDC lines.
Look at the cam gear...it should say UP and it should be facing up at this point. Now you adjust the lash on cylinder 1.
Now you turn the crank until the cam gear UP marker turns 90 degrees which would be a 1/4 turn on the cam gear. It should be facing to the left. Make sure you turn the motor counter clock wise.Now adjust Lash on cylinder 3
Now you turn the crank until the cam gear UP marker turns another 90 degrees which would be another 1/4 turn on the cam gear. It should be pointing down. Now adjust Lash on cylinder 4
Then repeat and do cylinder 2
Look at the cam gear...it should say UP and it should be facing up at this point. Now you adjust the lash on cylinder 1.
Now you turn the crank until the cam gear UP marker turns 90 degrees which would be a 1/4 turn on the cam gear. It should be facing to the left. Make sure you turn the motor counter clock wise.Now adjust Lash on cylinder 3
Now you turn the crank until the cam gear UP marker turns another 90 degrees which would be another 1/4 turn on the cam gear. It should be pointing down. Now adjust Lash on cylinder 4
Then repeat and do cylinder 2
08-09-2005, 04:48 PM
#3
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the easiest way to do it is like this...ive done a million valve adjustments..
stick a long screwdriver down the spark plug hole, and turn the crank until the screwdriver reaches the highest point, and there you go.
but you need TDC on the compression stroke, so to check and make sure it is on the compression stroke, you need to take the dist. cap off and make sure its point at the correct spark plug wire for that cylinder. if it isnt youll need to turn the crank another 180 degrees. remember to always turn the crank counter clockwise.
this way is also alot more accurate.
stick a long screwdriver down the spark plug hole, and turn the crank until the screwdriver reaches the highest point, and there you go.
but you need TDC on the compression stroke, so to check and make sure it is on the compression stroke, you need to take the dist. cap off and make sure its point at the correct spark plug wire for that cylinder. if it isnt youll need to turn the crank another 180 degrees. remember to always turn the crank counter clockwise.
this way is also alot more accurate.
08-09-2005, 07:31 PM
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08-10-2005, 12:26 PM
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When you adjust the lash when each cylinder is on it's compression stroke, all the valves are closed. That means that no pressure is on the rocker. You don't want to adjust the lash when a valve is trying to open or close.
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